Troy Matteson shot a 3-under-par 68 for a one-stroke lead over Jeff Maggert and Brian Harman after two rounds of the John Deere Classic in Silvis, Ill., on Friday.
Matteson was at 13-under 129.
Maggert’s bogey-free round of 9-under 62 moved him from 39th place after the first round to a tie for second. He birdied half the holes at TPC Deere Run, including five of his last nine.
Harman had a second straight 65, the last two of his seven birdies coming after a 48-minute thunderstorm delay.
Matteson bogeyed the par-4 18th after getting four birdies in the first 17 holes.
Maggert one-putted 10 greens and saved par twice en route to matching his career-low round. He finished by making a 13-foot birdie putt on the par-4 ninth hole.
‘‘I saw the putts better today,’’ Maggert said. ‘‘But I'm going to be aggressive tomorrow. I feel I need another really low round Saturday or Sunday, 7 or 8 under, to be in contention. The last few years, guys have really been lighting it up here.’’
Including Maggert’s 62 and Matteson’s first-round 61, there have been eight rounds of 62 or lower at Deere Run in the past five years, and 11 since the tournament moved to the course in 2000. The best effort was Paul Goydos’s Tour-record-tying 59 two years ago.
J.J. Henry, Gary Christian, Robert Garrigus, and Ricky Barnes are tied for fourth at 11-under 131.
A trio of players are at 10-under 132, including three-time defending champion Steve Stricker, whose 4-under 67 placed him within striking distance with 36 holes to play. Tommy Biershenk and two-time US Open champion Lee Janzen are also at 132.
Zach Johnson shot 6-under 65 and was at 9-under 133.
European — Phil Mickelson broke out of his slump with an 8-under 64 at the Scottish Open at Inverness, leaving him five shots off the second-round lead shared by Alexander Noren and Francesco Molinari.
Noren used another round of 66 to move to 12 under alongside Molinari, who couldn’t match his blistering 62 on Thursday but managed a 70.
Mickelson charged up the leaderboard in an overcast but largely wind-free round at the Castle Stuart links. The three-time Masters champion broke par for the first time since May, with an eagle and six birdies putting him in a strong position for the weekend and improving his confidence before the British Open.
His 64 matched the lowest round of the day — along with Ricardo Gonzalez and Matteo Manassero, who finished at 11 under.
S.S.P. Chowrasia of India was another shot back, while top-ranked Luke Donald shot 68.
Champions — Lance Ten Broeck, the full-time caddy for Tim Herron and a part-time player, shot a 68, putting him at 6-under 134 and one shot ahead of first-round leader Tom Kite in the US Senior Open at Indianwood in Lake Orion, Mich.
Ten Broeck has a chance to make about $500,000 on Sunday after earning less than half that total in his best year as a caddie and when he made a career-best $146,568 in 1989 as a PGA Tour player.